- allergy to TXA, refusal of blood products, preoperative use of anticoagulant therapy within 5 days of surgery, history of seizures, renal failure (creatine clearance <30ml/min), bleeding disorders, venous thromboembolism (deep vein thrombosis and/or pulmonary embolism), significant cardiac history (myocardial infarction, angina, stroke, lower limb ischemia), or perioperative anemia (hemoglobin <11g/dl in females and < 12g/dl in males).